CN111794030A - Method for widening dyke foundation at through-dyke building - Google Patents

Method for widening dyke foundation at through-dyke building Download PDF

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Publication number
CN111794030A
CN111794030A CN202010628032.1A CN202010628032A CN111794030A CN 111794030 A CN111794030 A CN 111794030A CN 202010628032 A CN202010628032 A CN 202010628032A CN 111794030 A CN111794030 A CN 111794030A
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CN
China
Prior art keywords
less
layer
soil
dike
widening
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Pending
Application number
CN202010628032.1A
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Chinese (zh)
Inventor
尹文锋
邓越胜
彭圣华
陆望明
汪鹏福
蔡鹏�
牛圣宽
尹祖超
刘新利
梁晓龙
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Changjiang Institute of Survey Planning Design and Research Co Ltd
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Changjiang Institute of Survey Planning Design and Research Co Ltd
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Priority to CN202010628032.1A priority Critical patent/CN111794030A/en
Publication of CN111794030A publication Critical patent/CN111794030A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00Foundations for pavings
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B3/00Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/04Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
    • E02B3/10Dams; Dykes; Sluice ways or other structures for dykes, dams, or the like

Abstract

The invention discloses a method for widening a dike foundation at a place where a dike passes through a dike building, which comprises the following steps: substrate treatment: carrying out step excavation treatment on the current situation dike backwater side slope, and fully paving an impermeable geomembrane along the excavated step; the steel wire meshes are added on the second layer and the penultimate layer of the foam light soil, the steel wire meshes are formed by welding steel wires, sticky soil wrapping edges are arranged on the outer sides of the foam light soil, concrete plates are lapped on the tops of the foam light soil, and three-way geogrids are fully paved below a pavement layer. And (3) paving a pavement structure layer on the concrete slab. The invention is a novel technology for widening the roadbed at the position where the dike-penetrating building exists, can effectively reduce the influence of the widened roadbed on the current dike-penetrating building, meets the engineering requirement of a specific road section, provides a feasible implementation scheme and provides support for the consistent width of the whole roadbed.

Description

Method for widening dyke foundation at through-dyke building
Technical Field
The invention relates to the field of road and dyke engineering, in particular to a method for widening a dyke foundation at a place where a dyke passes through a building; it is a treatment technology for widening embankment by adopting foamed light soil to form roadbed.
Background
Along with the development of the country, the living standard of people is improved, the requirement of people on hydrophilicity is higher and higher, the coastal rivers, the riverside cities and the lake-facing cities are comprehensively developed and utilized on the opposite bank lines, and the idea of constructing the beach, the dike, the road and the bank as a whole is gradually popularized. In many projects, in order to improve the overall effect and realize multifunctional unified coordination, the conventional dike is generally required to be subjected to treatments of widening, heightening and the like. However, due to various functional requirements, some through-dike buildings (such as pipelines or tunnels and the like) are locally arranged under the existing dike. The backfill material and the rolling mode of the general embankment combining section have great influence on the current embankment penetrating building, and even some sections can influence the feasibility of the scheme, so that a novel widened embankment base treatment technology is urgently needed for similar road sections.
At present, due to the connection of water conservancy, traffic, construction and the like to the professions, research and reports on the processing of the widened embankment base are rare, and relevant technical guidance is also lacked in relevant specifications. Therefore, it is necessary to develop a technique for widening the roadbed at the embankment structure.
Disclosure of Invention
The present invention aims to overcome the above-mentioned disadvantages of the prior art and to provide a method for widening a dyke base at a place where a dyke is to be penetrated. The invention reduces the influence of widening the roadbed on the current dike-penetrating building from the aspects of engineering safety, technical feasibility, convenient construction, engineering investment and the like, and meets the requirement of widening the dike foundation at the dike-penetrating building.
The object of the invention is achieved by the following measures: a method of widening a dyke base at a site through a dyke building, characterised by the steps of:
step 1, substrate treatment: after an original foundation is treated, a cohesive soil cushion layer with the thickness of 0.5m is arranged, cement with the weight of 12% is mixed into the cohesive soil, leveling, rolling and compacting are carried out, and the base compactness is not less than 90%;
step 2, digging steps on the side slope on the back water side of the dike in the current situation, wherein the steps incline inwards by 2-4 percent; the step height is consistent with the filling height of each layer of the foam light soil;
step 3, paving anti-seepage geomembranes along the excavation steps to reduce the influence of the dike on the newly filled foam light soil;
step 4, adding steel wire meshes to the second layer and the penultimate layer of the foamed light soil to enhance the capacity of the foamed light soil for bearing the vehicle load; the steel wire mesh is formed by welding steel wires, the diameter of each steel wire is not less than 3.2mm, and the aperture is less than 100 mm;
step 5, in order to avoid direct exposure of the foamed light soil, a cohesive soil wrapping edge is arranged on the outer side of the foamed light soil, the thickness of the cohesive soil wrapping edge is not less than 1.0m, and the cohesive soil filler meets the filling index requirements of roads and dikes;
and 6, in order to facilitate the construction of a pavement structure layer and improve the anti-cracking function of the foamed light soil, concrete plates are lapped on the top of the foamed light soil, and a three-dimensional geogrid is fully paved below the pavement layer, so that the influence of uneven settlement on the roadbed is reduced.
And 7, paving a pavement structure layer on the concrete slab.
In the technical scheme, when the foam light soil is used in a range of more than 0.8m away from the top surface of the roadbed, the compressive strength is more than or equal to 0.6 MPa; when the compressive strength is less than 0.8m from the top surface of the roadbed, the compressive strength is more than or equal to 0.8 MPa.
In the technical scheme, the thickness of the impermeable geomembrane is not less than 0.5mm, the longitudinal and transverse tensile strength is not less than 6kN/m, the CBR bursting strength is not less than 2.5kN, and the hydrostatic pressure resistance is not less than 0.7 MPa.
In the technical scheme, the cohesive soil is cohesive soil with 20-35% of clay content and 15-20% of plasticity index, and the permeability coefficient is controlled to be smaller than i multiplied by 10-5cm/s, wherein i is a positive integer from 1 to 9.
In the technical scheme, the ultimate tensile strength of the three-way geogrid is not less than 50kN/m, and the tensile strength at 2% elongation is not less than 20 kN/m; the three-dimensional geogrid is anchored by adopting U-shaped nails with the interval of 1 m.
The invention is a novel technology for widening the roadbed at the position where the dike-penetrating building exists, can effectively reduce the influence of the widened roadbed on the current dike-penetrating building, meets the engineering requirement of a specific road section, provides a feasible implementation scheme and provides support for the consistent width of the whole roadbed.
Drawings
FIG. 1 is a schematic diagram of the structure of the method of the present invention.
In the figure, 1, a road is built, 2, a pavement structure layer, 3, a current dike, 4, a three-way geogrid, 5, a concrete plate, 6, a cohesive soil edge covering, 7, a steel wire mesh (or called a metal mesh), 8, foamed light soil, 9, an anti-seepage geomembrane, 10, a cement soil cushion layer, 11, an original ground, 12, an excavation step and 13, a current dike penetrating building.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be clear and readily understood by the description.
Referring to FIG. 1: the invention discloses a method for widening a dyke foundation at a place where a dyke passes through a building, which is characterized by comprising the following steps of:
step 1, substrate treatment: after an original foundation is treated, a cohesive soil cushion layer with the thickness of 0.5m is arranged, cement with the weight of 12% is mixed into the cohesive soil, leveling, rolling and compacting are carried out, and the base compactness is not less than 90%;
step 2, digging steps on the side slope on the back water side of the dike in the current situation, wherein the steps incline inwards by 2-4 percent; the step height is consistent with the filling height of each layer of the foam light soil;
step 3, fully paving an anti-seepage geomembrane along the excavation step to reduce the influence of an embankment on the newly filled foam light soil;
step 4, adding steel wire meshes to the second layer and the penultimate layer of the foamed light soil to enhance the capacity of the foamed light soil for bearing the vehicle load; the steel wire mesh is formed by welding steel wires, the diameter of each steel wire is not less than 3.2mm, and the aperture is less than 100 mm;
step 5, in order to avoid direct exposure of the foamed light soil, a cohesive soil wrapping edge is arranged on the outer side of the foamed light soil, the thickness of the cohesive soil wrapping edge is not less than 1.0m, and the cohesive soil filler meets the filling index requirements of roads and dikes;
and 6, in order to facilitate the construction of a pavement structure layer and improve the anti-cracking function of the foamed light soil, concrete plates are lapped on the top of the foamed light soil, and a three-dimensional geogrid is fully paved below the pavement layer, so that the influence of uneven settlement on the roadbed is reduced.
And 7, paving a pavement structure layer on the concrete slab.
When the foam light soil is used in a range of more than 0.8m away from the top surface of the roadbed, the compressive strength is more than or equal to 0.6 MPa; when the compressive strength is less than 0.8m from the top surface of the roadbed, the compressive strength is more than or equal to 0.8 MPa.
The thickness of the impermeable geomembrane is not less than 0.5mm, the longitudinal and transverse tensile strength is not less than 6kN/m, the burst strength of CBR is not less than 2.5kN, and the hydrostatic pressure resistance is not less than 0.7 MPa.
The cohesive soil is cohesive soil with 20% -35% of clay content and 15-20 of plasticity index, and the permeability coefficient is controlled to be smaller than i multiplied by 10-5cm/s。
The ultimate tensile strength of the three-way geogrid is not less than 50kN/m, and the tensile strength at 2% elongation is not less than 20 kN/m; the three-dimensional geogrid is anchored by adopting U-shaped nails with the interval of 1 m.
The invention widens the structure of the dyke base at the position of a dyke penetrating building: the novel embankment comprises a current situation embankment 4, a current situation penetrating building 13 and a proposed road 1, wherein the proposed road 1 comprises an excavation step 12 located on a side slope on the back water side of the current situation embankment 4, an anti-seepage geomembrane 9 fully paved along the excavation step 12, a cement soil cushion layer 10 located on an original foundation and foamed light soil 8 located on the cement soil cushion layer 10, a steel wire mesh 7 is arranged on a second layer and a second last layer of the foamed light soil, concrete plates 5 are lapped at the tops of the foamed light soil 8, and a three-way geogrid 4 is fully paved between a pavement structure layer 2 and the concrete plates 5. And a cohesive soil edge covering 6 is arranged on the outer side of the foamed light soil. And excavation steps 12 are arranged on the outer side of the foam light soil at intervals.
The detailed construction process requirements of the technology for widening the dike foundation at the position of the dike penetrating building are as follows:
(1) the cast-in-place foam light soil is prepared according to the construction mixing proportion for later use, and when the cast-in-place foam light soil is used for the foam light soil which is more than 0.8m away from the top surface of the roadbed, the compressive strength is more than or equal to 0.6 MPa; when the foam light soil is used for foam light soil which is less than 0.8m away from the top surface of the roadbed, the compressive strength is more than or equal to 0.8 MPa.
(2) Excavating on the original dike backwater slope to form a standard step platform, wherein the width of the platform is preferably not less than 1.0 m; when the multi-stage opening and pedaling steps are arranged, the height of the single-stage steps is preferably 0.5 m-1.0 m. And laying a layer of anti-seepage geomembrane along the range of the step, wherein the anti-seepage geomembrane is made of PE (polyethylene), the thickness is not less than 0.5mm, the longitudinal and transverse tensile strength is not less than 6kN/m, the CBR bursting strength is not less than 2.5kN, and the hydrostatic pressure resistance is not less than 0.7 MPa.
(3) Cleaning the surface soil in the widened range of the dike, then backfilling after adopting cohesive soil mixed with cement, leveling, rolling and compacting, wherein the compactness of the substrate is not less than 90%.
(4) And pouring foam light soil. The top surface area of a single pouring area is not more than 400m2The division is made every 20m section along the longitudinal length of the road. Dividing the pouring height by combining the roadbed height, wherein the thickness of a single layer is 0.5-1.0 m, and the thickness of each layer is consistent with the thickness of a step at the joint; the road bed part is poured in two layers according to the thickness of two layers of 0.4mAnd (5) building. The interface of the pouring layer is the position of the metal net. After each layer is poured, a plastic film or an impermeable geomembrane is adopted for covering, moisturizing and maintaining.
(5) And setting a deformation joint. Except special conditions, the foam light soil is longitudinally provided with deformation joints which are transversely arranged and have the width of 2cm at intervals of 20m, and the deformation joints are filled with waterproof materials in classification.
(6) And constructing the metal net. And arranging steel wire meshes at the bottom and the top of the foam light soil filling body, wherein the steel wire meshes are consistent with the filling width of the foam light soil filling body, and are anchored by adopting U-shaped nails, and the U-shaped nails are arranged in a quincunx manner at the interval of 1 m.
(7) And an impermeable geomembrane. And covering and maintaining the foamed light soil within seven days after the construction is finished, and then laying an anti-seepage geomembrane, wherein the anti-seepage geomembrane is lapped with the anti-seepage geomembrane in the second step, and the lapping width is not less than 10 cm.
(8) And filling edge-covering soil. Filling by using cohesive soil, wherein the cohesive soil filling is cohesive soil with 20-35% of cohesive grain content and 15-20 of plasticity index, and the permeability coefficient is controlled to be less than i multiplied by 10-5cm/s。
(9) And constructing a top concrete slab. After the foamed lightweight soil is filled to a designed elevation and maintained, a C15 concrete slab with the thickness of 15cm is poured on the top surface of the foamed lightweight soil for facilitating the construction of a pavement structure, and after the concrete slab is poured, a plastic film or an impermeable geomembrane is adopted for covering, moisturizing and maintaining.
(10) And laying the three-dimensional geogrids. And (3) paving a three-way geogrid on the top concrete slab in the eighth step below the road surface structure layer for widening the roadbed range, wherein the ultimate tensile strength of the geogrid is not less than 50kN/m, and the tensile strength at 2% elongation is not less than 20 kN/m. The three-dimensional geogrid is anchored by adopting U-shaped nails, and the U-shaped nails are arranged in a quincunx shape with the interval of 1 m.
(11) And paving a pavement structure layer, namely paving the pavement structure layer according to the pavement structure required by the design file.
The positional relationship terms described in the present invention are only described with reference to the corresponding drawings for orientation, and are not limited to the positional relationship.
Other parts not described belong to the prior art.

Claims (5)

1. A method of widening a dyke base at a site through a dyke building, characterised by the steps of:
step 1, substrate treatment: after an original foundation is treated, a cohesive soil cushion layer with the thickness of 0.5m is arranged, cement with the weight of 12% is mixed into the cohesive soil, leveling, rolling and compacting are carried out, and the base compactness is not less than 90%;
step 2, digging steps on the side slope on the back water side of the dike in the current situation, wherein the steps incline inwards by 2-4 percent; the step height is consistent with the filling height of each layer of the foam light soil;
step 3, paving the anti-seepage geomembrane fully along the excavation step;
step 4, adding steel wire meshes on the second layer and the penultimate layer of the foamed light soil, wherein the steel wire meshes are formed by welding steel wires, the diameter of each steel wire is not less than 3.2mm, and the aperture is less than 100 mm;
and 5, arranging cohesive soil covered edges on the outer sides of the foamed light soil, wherein the thickness of the cohesive soil covered edges is not less than 1.0m, and the cohesive soil filler is required to meet the filling index requirements of roads and dikes.
And 6, overlapping the top of the foamed light soil by using concrete plates, and fully paving a three-way geogrid below the pavement layer.
And 7, paving a pavement structure layer on the concrete slab.
2. Method for widening dykes at a penetrating building according to claim 1, characterised in that: when the foam light soil is used in a range of more than 0.8m away from the top surface of the roadbed, the compressive strength is more than or equal to 0.6 MPa; when the compressive strength is less than 0.8m from the top surface of the roadbed, the compressive strength is more than or equal to 0.8 MPa.
3. Method for widening dykes at a penetrating building according to claim 1, characterised in that: the thickness of the impermeable geomembrane is not less than 0.5mm, the longitudinal and transverse tensile strength is not less than 6kN/m, the burst strength of CBR is not less than 2.5kN, and the hydrostatic pressure resistance is not less than 0.7 MPa.
4. Method for widening dykes at a penetrating building according to claim 1, characterised in that: the cohesive soil is cohesive soil with 20% -35% of clay content and 15-20 of plasticity index, and the permeability coefficient is controlled to be smaller than i multiplied by 10-5cm/s。
5. Method for widening dykes at a penetrating building according to claim 1, characterised in that: the ultimate tensile strength of the three-way geogrid is not less than 50kN/m, and the tensile strength at 2% elongation is not less than 20 kN/m; the three-dimensional geogrid is anchored by adopting U-shaped nails with the interval of 1 m.
CN202010628032.1A 2020-07-01 2020-07-01 Method for widening dyke foundation at through-dyke building Pending CN111794030A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105569058A (en) * 2016-02-16 2016-05-11 中国建筑第六工程局有限公司 Expansive soil cutting structure and construction method thereof
CN106703050A (en) * 2016-11-30 2017-05-24 中铁二院昆明勘察设计研究院有限责任公司 Expansive soil road cutting side slope reinforced soil back-pressure seepage-preventive supporting structure and construction method thereof
CN108755320A (en) * 2018-08-27 2018-11-06 山东大学 A kind of reinforcement Foam lightweight soil Widening Embankment structure and its construction method
CN110485218A (en) * 2019-09-11 2019-11-22 北京铁科特种工程技术有限公司 It is a kind of to help wide construction method for railway bed
CN110725162A (en) * 2019-10-22 2020-01-24 中铁十局集团第八工程有限公司 Roadbed device for rail transit and manufacturing method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105569058A (en) * 2016-02-16 2016-05-11 中国建筑第六工程局有限公司 Expansive soil cutting structure and construction method thereof
CN106703050A (en) * 2016-11-30 2017-05-24 中铁二院昆明勘察设计研究院有限责任公司 Expansive soil road cutting side slope reinforced soil back-pressure seepage-preventive supporting structure and construction method thereof
CN108755320A (en) * 2018-08-27 2018-11-06 山东大学 A kind of reinforcement Foam lightweight soil Widening Embankment structure and its construction method
CN110485218A (en) * 2019-09-11 2019-11-22 北京铁科特种工程技术有限公司 It is a kind of to help wide construction method for railway bed
CN110725162A (en) * 2019-10-22 2020-01-24 中铁十局集团第八工程有限公司 Roadbed device for rail transit and manufacturing method

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